Finding the Third Proportional to 10,128 and 21,360

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128 : 21,360 = 21,360 : x
2. Step 2: Convert to fraction form
   10,128/21,360 = 21,360/x
3. Step 3: Cross multiply
   10,128x = 21,360 × 21,360
4. Step 4: Simplify right side
   10,128x = 456,249,600
5. Step 5: Solve for x
   x = 456,249,600/10,128
6. Step 6: Final answer
   x = 45,048.34